Better swift interop; better iOS 9+ support; and don't show activity if Chrome not installed.

.gitignore

@@ -2,3 +2,26 @@
 ChromeActivityDemo.xcodeproj/project.xcworkspace/xcuserdata/Alex.xcuserdatad/UserInterfaceState.xcuserstate
 
 ChromeActivityDemo.xcodeproj/xcuserdata/Alex.xcuserdatad/xcdebugger/Breakpoints.xcbkptlist
+
+
+# Xcode
+#
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+*.xcuserstate
+
+
+.DS_Store

ARChromeActivity/ARChromeActivity.h

@@ -16,14 +16,14 @@
 @interface ARChromeActivity : UIActivity
 
 /// Uses the "CFBundleName" from your Info.plist by default.
-@property (strong, nonatomic) NSString *callbackSource;
+@property (strong, nonatomic, nonnull) NSString *callbackSource;
 
-/// The text beneath the icon. Defaults to "Chrome".
-@property (strong, nonatomic) NSString *activityTitle;
+/// The text beneath the icon. Defaults to "Open in Chrome".
+@property (strong, nonatomic, nonnull) NSString *activityTitle;
 
 /// Empty by default. Either set this in the initializer, or set this property. For iOS 9+, make sure you register the Chrome URL scheme in your Info.plist. See the demo project.
-@property (strong, nonatomic) NSURL *callbackURL;
+@property (strong, nonatomic, nullable) NSURL *callbackURL;
 
-- (id)initWithCallbackURL:(NSURL *)callbackURL;
+- (nonnull id)initWithCallbackURL:(nullable NSURL *)callbackURL;
 
 @end

ARChromeActivity/ARChromeActivity.m

@@ -16,10 +16,7 @@
 @implementation ARChromeActivity {
     NSURL *_activityURL;
 }
-
-@synthesize callbackURL = _callbackURL;
-@synthesize callbackSource = _callbackSource;
-@synthesize activityTitle = _activityTitle;
+@synthesize activityTitle = _title;
 
 static NSString *encodeByAddingPercentEscapes(NSString *input) {
     NSString *encodedValue = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)input, NULL, (CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8));
@@ -28,7 +25,12 @@ @implementation ARChromeActivity {
 
 - (void)commonInit {
     _callbackSource = [[NSBundle mainBundle]objectForInfoDictionaryKey:@"CFBundleName"];
-    _activityTitle = @"Open in Chrome";
+    _title = @"Open in Chrome";
+}
+
+- (NSString *)activityTitle
+{
+    return _title;
 }
 
 - (id)init {
@@ -61,6 +63,9 @@ - (NSString *)activityType {
 }
 
 - (BOOL)canPerformWithActivityItems:(NSArray *)activityItems {
+    if (![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"googlechrome://"]]) {
+        return NO;
+    }
     if (_callbackURL && ![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"googlechrome-x-callback://"]]) {
         return NO;
     }
@@ -89,13 +94,44 @@ - (void)prepareWithActivityItems:(NSArray *)activityItems {
 }
 
 - (void)performActivity {
-    NSString *openingURL = encodeByAddingPercentEscapes(_activityURL.absoluteString);
-    NSString *callbackURL = encodeByAddingPercentEscapes(self.callbackURL.absoluteString);
-    NSString *sourceName = encodeByAddingPercentEscapes(self.callbackSource);
-
-    NSURL *activityURL = [NSURL URLWithString:[NSString stringWithFormat:@"googlechrome-x-callback://x-callback-url/open/?url=%@&x-success=%@&x-source=%@", openingURL, callbackURL, sourceName]];
-    [[UIApplication sharedApplication] openURL:activityURL];
-    [self activityDidFinish:YES];
+
+    BOOL success = NO;
+
+    if (_activityURL != nil) {
+
+        if (self.callbackURL && self.callbackSource) {
+            NSString *openingURL = encodeByAddingPercentEscapes(_activityURL.absoluteString);
+            NSString *callbackURL = encodeByAddingPercentEscapes(self.callbackURL.absoluteString);
+            NSString *sourceName = encodeByAddingPercentEscapes(self.callbackSource);
+
+            NSURL *activityURL = [NSURL URLWithString:[NSString stringWithFormat:@"googlechrome-x-callback://x-callback-url/open/?url=%@&x-success=%@&x-source=%@", openingURL, callbackURL, sourceName]];
+            [[UIApplication sharedApplication] openURL:activityURL];
+            success = YES;
+        } else {
+
+            NSString *scheme = _activityURL.scheme;
+
+            NSString *chromeScheme = nil;
+            if ([scheme isEqualToString:@"http"]) {
+                chromeScheme = @"googlechrome";
+            } else if ([scheme isEqualToString:@"https"]) {
+                chromeScheme = @"googlechromes";
+            }
+
+            if (chromeScheme) {
+                NSString *absoluteString = [_activityURL absoluteString];
+                NSRange rangeForScheme = [absoluteString rangeOfString:@":"];
+                NSString *urlNoScheme = [absoluteString substringFromIndex:rangeForScheme.location];
+                NSString *chromeURLString = [chromeScheme stringByAppendingString:urlNoScheme];
+                NSURL *chromeURL = [NSURL URLWithString:chromeURLString];
+
+                [[UIApplication sharedApplication] openURL:chromeURL];
+                success = YES;
+            }
+        }
+    }
+
+    [self activityDidFinish:success];
 }
 
 @end